docs: def get_sns_subscriptions(app_name, env, region):
      """List SNS lambda subscriptions.
  
      Returns:
          list: List of Lambda subscribed SNS ARNs.
  
      """
      session = boto3.Session(profile_name=env, region_name=region)
      sns_client = session.client('sns')
  
      lambda_alias_arn = get_lambda_alias_arn(app=app_name, account=env, region=region)
  
      lambda_subscriptions = []
      subscriptions = sns_client.list_subscriptions()
  
      for subscription in subscriptions['Subscriptions']:
          if subscription['Protocol'] == "lambda" and subscription['Endpoint'] == lambda_alias_arn:
              lambda_subscriptions.append(subscription['SubscriptionArn'])
  
      if not lambda_subscriptions:
          LOG.debug('SNS subscription for function %s not found', lambda_alias_arn)
  
      return lambda_subscriptions